JPS602561Y2 - Lens barrel locking mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a locking mechanism suitable for use in a lens barrel.

FIG. 1 is a cross-sectional view of a main part showing a conventional click plate groove, which exerts a locking action between a fixed cylinder 1 and a rotating member 2 fitted so as to be rotatable relative to the fixed cylinder 1. Locking mechanism 4 for
shows.

The locking mechanism 4 includes a cavity 2a formed on the inner diameter surface of the rotary member 2 in which a click ball 6 is housed, and a cavity 2a formed on the inner diameter surface of the rotary member 2.
A presser member 10 holding a spring member 8 that presses the click ball 6 against the outer diameter surface of the fixed barrel 1 is screwed into the screw hole 2b, and the presser member 10 is screwed into the screw hole 2b. The click ball 6 is pressed by screwing, that is, the rotating member is locked.

The inner diameter part of the presser member 10 consists of a small diameter part that holds the spring member 8 and a large diameter part that holds the click ball 6.The large diameter part holds the click ball, and the click ball is formed on the outer diameter surface of the fixed barrel. The stop groove 1a is locked and held.

In the above-mentioned conventional locking mechanism, the click ball 6 shown in FIG. 1. Tighten the screw of the presser member at the position shown in Figure C, and the fixed cylinder 1
Traces of the click ball 6 remained on the top, and a click feeling was felt when operating the rotary member even outside the predetermined locking position, resulting in malfunctions and malfunctions.

The present invention prevents malfunctions and malfunctions caused by the traces of click balls as described above in a locking mechanism that locks a rotating member that rotates relative to the fixed barrel of the lens barrel at a predetermined position on the fixed barrel 1. The purpose is to provide a locking mechanism that prevents.

FIG. 2 shows an embodiment according to the present invention, and the same reference numerals as in FIG. When fixing the rotating member, the pressing force of the holding part 8a of the holding member 8 is applied to a certain area of the outer diameter surface of the fixed cylinder, thereby avoiding impressions caused by the pressing force of the holding member. be.

In FIG. 2, one end is fixed to the cavity 2a of the rotary member 2, a convex portion 12a is provided approximately in the middle and can be pressed onto the fixed cylinder, and a free end portion 12b of the presser member 8 extends in the direction of the presser portion 8a. A spring member 12 having the following characteristics is disposed.

The convex shape of the convex part 12a of the spring member 12 may be acute-angled or semicircular as shown in FIG. Formed so as to exert a clicking effect by falling.

The click groove 1a may be provided arbitrarily on the fixed body at a predetermined locking position of the rotating member, and the click groove 1a may be provided with the convex portion 1 of the spring.
The rotating member 2 is fixed by screwing the holding member 8 into the depressed position of the spring member 2a and pressing the free end 12b of the spring member against the fixed cylinder 1.

Also, when the rotating member 2 is to be fixed on the fixed cylinder at an intermediate position without the click groove 1a, that is, at an arbitrary position (for example, a position as shown in FIG. 2), this embodiment can also be used with the presser foot. This can be done by pressing the holding portion 8a of the member 8 against the free end 12b of the spring member 12.

In this embodiment, since the convex portion 12a of the spring member is not directly pressed by the pressing member 8, the click groove 1 as shown in FIG.
Even when the rotating member 2 is fixed at an arbitrary position without a, there is no impression left on the rotating surface of the fixed barrel 1, which prevents discomfort or malfunction/misoperation when rotating the rotating member. do not have.

Next, we will discuss the use of this invention.

Figure 3 shows an earlier application filed by the same applicant as the present application (Showa 54?-
It is a sectional view of a main part of a lens barrel (named "Lens Lens Barrel") on October 28th.

In the lens barrel shown in FIG. 3, the lens barrel 20 is divided into a front lens barrel 20a and a rear lens barrel 20b, and the rear lens barrel 20b is separated from the front lens barrel 20.
The film surface 26 of the camera 24 mounted on the rear lens barrel 20b can be rotated around the optical axis with respect to the rear lens barrel 20b so that the vertical and horizontal positional relationship can be changed.

A convex retaining portion 20b' is provided at the tip of the rear lens barrel 20b, and the convex engaging portion 20b' is provided at the rear end of the front lens barrel 20a.
A recessed engaging portion 20a' is formed to be engaged so as to enclose the recessed portion 20a'.

203'' is a tightening ring for forming the recess engaging portion 20a'.

20c is an operation member of a focus mechanism (not shown) disposed on the front lens barrel 20a.

A tripod mounting member 22 is fixed to the front lens barrel 20a, and the rear lens barrel 20b has an aperture device 20d, an aperture setting ring 20f, and interlocking signal members 20e, 20e2, etc. that maintain the interlocking relationship between the camera 24 and the aperture device 20d. A mechanism is in place.

20g indicates a mount member.

In the lens barrel of FIG. 3 described above, the tripod mounting member 22
Attach a tripod (not shown) to the rear lens barrel 20 in order to prepare for shooting and change the vertical and horizontal positional relationship of the film surface 26 of the camera.
Rotate b together with the camera.

In that case, a locking mechanism as shown in FIG. 2 is provided between the recessed engaging portions 20a' and 202'' of the front barrel and the protruding engaging portion 20b' of the rear barrel.

In this case, the structural relationship between the rotating member and the fixed barrel in Figure 2 is reversed, and the front lens barrel fixed to the tripod is used as the fixed barrel, and the rear lens barrel that can be rotated with respect to the front lens barrel is used as the rotating member. Front lens barrel 20a
A presser member is attached to the engaging portion 20a'.

The rotating rear lens barrel 20b and the fixed front lens barrel 2
By using the locking mechanism shown in FIG. 2 above between the concave engaging portion 20a' and the convex retaining portion 20b of 0a, it is possible to provide a lens barrel with excellent operability.

The lens barrel as shown in FIG. 3 has a focus mechanism and an operating member 30c on the front barrel 30a side that is fixed to the tripod, and an aperture/interlocking mechanism and a camera body on the rear barrel 30b side. By rotating the rear lens barrel around the optical axis, it is possible to easily change the vertical/horizontal relationship of the image frame on the film surface 36 and lock it at any angular position. .

In particular, this type of lens barrel, such as a telephoto zoom lens or a focus type lens, has a large diameter and a large weight.
The locking mechanism disposed between the engaging portions of the concave portion 20a' and the locking mechanism 20a' is prone to indentations and marks due to the weight and load pressure of the lens barrel. By using this mechanism, the drawbacks of conventional reporting operations can be overcome.

As described above, the present invention provides a mechanism for locking a rotating member that rotates relative to a fixed barrel of a lens barrel at a predetermined position or an arbitrary position, with one end fixed to the rotating member and the other end fixed to the rotating member. A spring member with a free end is disposed between the rotary member and the fixed barrel, and is held by the rotary member and presses one end of the spring member with a presser member that can be operated from outside the lens barrel. The movable member is fixed to a fixed barrel, and the present invention provides a mechanism that has both a locking action and a click action, and also eliminates impressions when pressed and eliminates discomfort during operation. can be provided.

[Brief explanation of the drawing]

Fig. 1 shows a conventional example of the technology related to the present invention, Fig. 1 a shows a state in which the ball 6 has fallen into the click position, Fig. 1 shows a state in which it is tightened, and Fig. 1 C shows a state in which the ball 6 is not in the click position. FIG. FIG. 2 is a sectional view of a main part of an embodiment of the present invention. FIG. 3 is a sectional view of a main part of an interchangeable lens, showing the use of the present invention. 1...Fixed cylinder, 2...Rotating member, ball, 10...Tightening member. 6...crits

Claims (1)

[Scope of utility model registration request] A spring member with one end fixed is provided on the inner periphery of a rotating member that rotates relative to the fixed MJ, and a convex that engages in a click groove formed on the fixed body between the fixed end and the free end of the spring member. What is claimed is: 1. A locking mechanism for a lens barrel, comprising: a retaining member for fixing the spring member to the fixed barrel;